Port Summarization II

Summary table contains entries like
    TCP Traffic Matrix
    src dst      packets     bytes
    80  0       185875699  131439625822
    0   0        73328126   26121563040
    119 0        18383602   17246484519
    20  0        13555941   12549586558
    0   80      122767195    9724773087

Note the `0 0' table entry
Protocols like passive FTP
Servers running on non-standard ports
Unknown services